Humidifier



FIG. 1 is a perspective front view of the design for a humidifier in accordance with the present invention;

FIG. 2 is a perspective view of one side thereof;

FIG. 3 is a perspective view of another side thereof;

FIG. 4 is a perspective rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a humidifier, as shown. 